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<li><a class="reference internal" href="#">pair_style smd/hertz command</a><ul>
<li><a class="reference internal" href="#syntax">Syntax</a></li>
<li><a class="reference internal" href="#examples">Examples</a></li>
<li><a class="reference internal" href="#description">Description</a></li>
<li><a class="reference internal" href="#restrictions">Restrictions</a></li>
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<div class="section" id="pair-style-smd-hertz-command">
<span id="index-0"></span><h1>pair_style smd/hertz command</h1>
<div class="section" id="syntax">
<h2>Syntax</h2>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">pair_style</span> <span class="n">smd</span><span class="o">/</span><span class="n">hertz</span> <span class="n">scale_factor</span>
</pre></div>
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<h2>Examples</h2>
<p>pair_style smd/hertz 1.0
pair_coeff 1 1 <contact_stiffness></p>
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<div class="section" id="description">
<h2>Description</h2>
<p>The <em>smd/hertz</em> style calculates contact forces between SPH particles belonging to different physical bodies.</p>
<p>The contact forces are calculated using a Hertz potential, which evaluates the overlap between two particles
(whose spatial extents are defined via its contact radius).
The effect is that a particles cannot penetrate into each other.
The parameter <contact_stiffness> has units of pressure and should equal roughly one half
of the Young’s modulus (or bulk modulus in the case of fluids) of the material model associated with the SPH particles.</p>
<p>The parameter <em>scale_factor</em> can be used to scale the particles’ contact radii. This can be useful to control how close
particles can approach each other. Usually, <em>scale_factor</em>=1.0.</p>
<hr class="docutils" />
<p><strong>Mixing, shift, table, tail correction, restart, rRESPA info</strong>:</p>
<p>No mixing is performed automatically.
Currently, no part of USER-SMD supports restarting nor minimization.
rRESPA does not apply to this pair style.</p>
</div>
<hr class="docutils" />
<div class="section" id="restrictions">
<h2>Restrictions</h2>
<p>This fix is part of the USER-SMD package. It is only enabled if
LAMMPS was built with that package. See the <span class="xref std std-ref">Making LAMMPS</span>
section for more info.</p>
</div>
<div class="section" id="related-commands">
<h2>Related commands</h2>
<p><a class="reference internal" href="pair_coeff.html"><span class="doc">pair_coeff</span></a></p>
<p><strong>Default:</strong> none</p>
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